How To Find Density In Physics. Usually, the units in which the density of air is measured is the standard temperature and pressure (stp). Again number density given by n = n / v, where n is the total number of particle.
The formula for density is: The formula for volume is, volume = mass × density \rho = \frac{m}{v} the proper si units for density are g/cubic cm (grams per cubic centimeters), alternately expressed as kg/cubic m (kilograms per cubic meters).
